Neutral density glass filters designed for qualification of absorbance accuracy and linearity in near-infrared spectrophotometers with spectral bandwidths of 6.5 nm or less, covering 800 nm to 3200 nm wavelength range. The filters are mounted stress-free in anodised aluminium holders to ensure mechanical stability and spectral performance.
The optical properties are based on well-established Schott NG-type glasses suitable for near-infrared calibration. The transmission spectrum is relatively flat across the calibration range but shows significant deviation above 2700 nm. Certified calibration values in % Transmission and Absorbance are provided at 1100, 1700, 2210, 2500, and 2850 nm for three standard filters designated R1, R3, and I1.
Neutral density glass filters designed for qualification of absorbance accuracy and linearity in near-infrared spectrophotometers with spectral bandwidths of 6.5 nm or less, covering 800 nm to 3200 nm wavelength range. The filters are mounted stress-free in anodised aluminium holders to ensure mechanical stability and spectral performance.
The optical properties are based on well-established Schott NG-type glasses suitable for near-infrared calibration. The transmission spectrum is relatively flat across the calibration range but shows significant deviation above 2700 nm. Certified calibration values in % Transmission and Absorbance are provided at 1100, 1700, 2210, 2500, and 2850 nm for three standard filters designated R1, R3, and I1.
